Alarm-fuse.



No. 850,365. PATENTEDAPR. 16, 1907.

W. E. HARKNESS.

ALARM FUSE. APPLIUATION FILED 313.24. 1906.

' .To all whom it 'may concern:

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UNITED-STATES PATENT OEEICE -WILLIAM E. HARKNESS, OF CHICAGO, ILLINOIS, ASSIGNOE To WESTERN VELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATIONl OE ILLI- N OIS.

ALARM-FUSE.

Be it known that I, WILLIAM E. HARKNESS, a citizen of the United States, residing at Chicago,`in thecounty of Cook and State of IllinoIs', have invented a certain new and useful Improvement in Alarm-Fuses, of which the" following 1s a full, clear, concise, and exact description. r p

My inventionrelates to an alarm-fuse, and has for its object to provide an improved and efficient device which will be very simple and cheap to manufacture.

I will describe my invention by reference to the accompanying drawings, which represent the preferred embodiment thereof, reserving for the'appended claims a statement of the parts, improvements, and combinations which I consider novel with me.

In the drawings, Figure l is a perspective view of anV alarm-fuse' embodying my invention. Fig. 2 is a longitudinal sectional view thereof, and Fig. 3 is a transverse. sectional View on line 3 3 of Fig. 2.

The same letters of reference are used to p designate the same parts wherever shown.

cuit well known The alarm-fuse shown is especially adaptf ed for use inte'lephone-eXchanges in order to guard the apparatus against abnormal currents, the fuses when blown bringing about the closure of a grounded alarm-oir-l in the art.

The flat body portion a of the fuse shown and the terminal a thereof at one end of the body portion are formed integrally, being stamped from a single piece of metal. The body portion Supports. at its other end an insulated terminal a2, said body portion having an extension 113 adapted to fit within the-terminal a2, which preferably comprises a flat metal collar, an insulating-sleeve b being interpo'sed between the collar and extension'aa.

A spring-tongue c is secured at one end to the body portion, being preferably struck out from said body portion, and lies at the rear of the body portion. with its free end adjacent the terminal u?,

nal a2 while maintaining the tongue under tension.

The terminal a2 preferably carries Specication of Letters Patent. Application filed February 24| 1906. Serial No. 302.667.

-tongue c.

particularly a fuse-wire d electric-V lally connecting the tongue with said termi` Patented April 16, 1907.

arm a, to which one end of the fuse-wire d is secured, the other end being secured to the opening inthe body portion formed by the striking out of said tongue. The body portion ais preferably corrugated, as shown, to

give the device strength. v

In practice when the spring-,tongue c is released by the blowing alarm-circuit containing a bell o'r other suitable signal device.

With my arrangement it will be seen that the fuse comprises parts for assembly struction, while very Simple and cheap to manufacture. i

I claim- 1; An alarm-fuse comprising a body por- .I tion of metal, a termina at one end ofsaid. body portion formed integrally therewith,

-an Insulated terminal upon the jother end of said body portion, a spring-tongue secured at one end to said body sion of said insulated terminal on the side of the body portion oppositesaid tongue, and a4 fuse passing through an opening in said body portion andv uniting said extension with the free end of said tongue, and maintaining said tongue undertension.

2. An alarm-fuse comprising a metal body portion, a terminal at one end thereof formed integrally therewith, an insulated terminal Aat the other end of said body-portion, a

spring-tongue struck out vfrom said body portion, an extension of sai-d insulated terminal, and a fuse connecting said tongue and extension and holding said tongue under t'enjV sion'. I

` .-3. A n alarm-fusecomprising a body portion and term-'nal at one end thereof, said metal, a flat Inetal collar or termina over the other end insulating-sleeve between said collar. and body portion, an angular extension of said ollar, a spring-tongue stam ed from said od body portion opposite said extension, `and a fuse-wire connecting said tongue and eXtenfitting sion to maintain said tongue under tension.

4. alarm-fuse comprising an integrallyof the fuse it closes an' portion, an leXten- The fuse-wire passes through the the'minimum number vof v and 1s substantial In oon-y 'parts being stamped from a single. iece of I of said. bodyfport'on, an

y portion and lying on te side of the Iloo formed metal body portion, sprng-nnguc, my naine this 20th day of Fobrumy, A. D. and terminal, an nlsulated terminal cmfwdf i906. by said body poltion, and a fuse-WH@ elec f 4 "rc trcally connecting said tongue yand insulated TNILLIAM D H'Alg'hbh" J tennna] and maintaining said tongue under Wtnessses:

tension. ROY T. ALLOWAY, n Witness whereof I hereunii-O lQubscrbe E. F. BEAUBEN. 

